Food safety

Food safety is not a mood. Canning, dairy, and many ferments have failure modes that enthusiasm does not cancel. This page points at authorities. It does not invent process times.

Canning #

NCHFP, adapting USDA AIB 539: Clostridium botulinum can grow in moist, low-acid, low-oxygen food and produce a deadly toxin. Acid foods (pH 4.6 or below) may be boiling-water canned with a researched time. Low-acid foods need a pressure canner at 240–250 °F ¹. Details: Canning and Acidity.

Cooking Jam until it gels is not the same as canning it. The strawberry formula in this encyclopedia follows NCHFP, including altitude-adjusted boiling-water times ². If you change fruit, sugar, or acid, you are no longer on that process. See Strawberry jam (powdered pectin).

Dairy #

U.S. cheddar identity requires that if dairy ingredients are not pasteurized, the cheese is cured at not less than 35 °F for at least 60 days ³. That is a rule for a standardized commercial cheese, not a home-cheesemaking procedure this site will improvise. Fresh cheeses and raw milk have different, stricter practical risks. Do not invent a “safe” aging chart.

Fermentation #

Sourdough and wine are not canning. They still fail — off smells, unwanted films, exploding bottles. When a ferment is used as a preservation method (some pickles, some cured meats), use a tested process. This encyclopedia has not built those pages yet. Until it does, do not treat bread starter as a model for low-acid canned food.

If two authorities disagree, follow the tested process for your jurisdiction and altitude. Do not average them. Preserving is the craft hub.